Note: Unless you are using a severely outdated operating system or CPU, you most likely want to always download the x64 (64-bit) version of Ultimate Doom Builder.
The 64-bit version has less limitations on the total size of the project that you can load and edit, while the x86 (32-bit) version of Ultimate Doom Builder only exists for compatibility with older PCs.
If not sure, follow these instructions to find out whether your system is 64-bit: Which version of Windows operating system am I running?
The 64-bit version has less limitations on the total size of the project that you can load and edit, while the x86 (32-bit) version of Ultimate Doom Builder only exists for compatibility with older PCs.
If not sure, follow these instructions to find out whether your system is 64-bit: Which version of Windows operating system am I running?
All recent versions
Ultimate Doom Builder R4224
04 Apr 2025
DeHackEd Parser: fixed a problem where things without DoomEdNums would get DoomEdNum -1 assigned. Fixes #1184
Ultimate Doom Builder R4223
29 Mar 2025
Sound Environment Mode: changed alpha values of things other than sound environment things
Ultimate Doom Builder R4222
29 Mar 2025
Fixed a problem where alpha values were applied twice when rendering things in classic modes
Ultimate Doom Builder R4221
29 Mar 2025
Preferences dialog: fixed an issue where linedef and thing alpha values where not set correctly. Fixes #1064
Ultimate Doom Builder R4220
27 Mar 2025
Sound Environment Mode: inserting a sound environment thing will now apply "clean" thing properties instead of the ones of the last edited thing. Fixes #1175